Add support for WebIO.

[codecov[bot]]

Codecov Report

Base: 78.46% // Head: 81.56% // Increases project coverage by +3.10% :tada:

Coverage data is based on head (dbe0d1b) compared to base (da14193). Patch coverage: 74.19% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12 +/- ## ========================================== + Coverage 78.46% 81.56% +3.10% ========================================== Files 10 11 +1 Lines 585 651 +66 ========================================== + Hits 459 531 +72 + Misses 126 120 -6 ``` | [Impacted Files](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB) | Coverage Δ | | |---|---|---| | [src/webio.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL3dlYmlvLmps) | `61.11% <61.11%> (ø)` | | | [src/Webviews.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL1dlYnZpZXdzLmps) | `90.90% <83.33%> (-2.85%)` | :arrow_down: | | [src/API.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL0FQSS5qbA==) | `90.74% <100.00%> (-2.88%)` | :arrow_down: | | [src/platforms/apple/Impl.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL3BsYXRmb3Jtcy9hcHBsZS9JbXBsLmps) | `82.90% <100.00%> (+1.08%)` | :arrow_up: | | [src/platforms/common\_bind.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL3BsYXRmb3Jtcy9jb21tb25fYmluZC5qbA==) | `100.00% <100.00%> (ø)` | | | [src/platforms/linux/Impl.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL3BsYXRmb3Jtcy9saW51eC9JbXBsLmps) | `93.75% <0.00%> (+2.75%)` | :arrow_up: | | [src/platforms/windows/Impl.jl](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB#diff-c3JjL3BsYXRmb3Jtcy93aW5kb3dzL0ltcGwuamw=) | `81.03% <0.00%> (+2.77%)` | :arrow_up: | | ... and [1 more](https://codecov.io/gh/sunoru/Webviews.jl/pull/12?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=%E3%82%B9%E3%83%8E%E3%83%AB)

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